Although we benefit from our close friendships, these friendships are not a matter of calculable gain and loss.

虽然我们从亲密的友谊中获益，但是友谊不能拿来计算得失。

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Although we apparently have a need for REM sleep, judging from the fact that our bodies automatically compensate for a loss of it, what REM sleep actually does for us is not clear.

从我们的身体能够自动地对损失作出补偿这个事来看，尽管我们明显地需要REM Crapid eye movement睡眠，但REM睡眠对我们的身体有什么作用还不清楚。

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